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I have been utilizing a MST from OR3GUN and it really doesn't seem to do much. I live about 75 miles north of San Francisco and the climate here is not excessively wet. I think the only effective solution is stripping/cleaning after every shooting session and lubricating the Piston Bore with a...

Any of you also experiencing Rust/Pitting in the Gas Piston Bore on your 930 series shotguns? Nice of Mossberg to cheap out and not chrome the bore for the gas piston. I guess if one is anal and cleans their gun after every shooting session, it might be less of a problem. Other than that, what...